useless information unless you use REM37BY in your C90

[huston marlowe]

The REM 37BY plug is approved for the C85 but is not on E-252 for the C90. I use the REM37BY for their short exterior, not for their reach into the combustion chamber. Some Algebra, using dimensions in the book for the 85 v. the 90 , calculates the 85 combustion chamber at 8.87 in cu. The 90 is 8.38 in cu. ie, the top of the piston of the 90 rises higher in the cylinder than the 85 piston. The top of the 90 piston is .038" closer to hitting those extended tip plugs . My experiment on a 90 engine determines they don't hit...but they come close !

 

[JimC]

 

[huston marlowe]

 

[reileyr]

 

[huston marlowe]

 

[bob turner]

 

[huston marlowe]

 

[lycominglou]

 

[dnnewman]

 

[huston marlowe]